<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			var score=prompt("请输入您的分数");
			
			if (score>=90) {
				alert("你真的很优秀");
			}else if(score>=80){
				alert("良好");
			}else if(score>=60){
				alert("刚刚及格");
			}else{
				alert("同志仍需努力");
			}
		</script>
	</head>
	<body>
	</body>
</html>
